US4667783A - Park lock device for use with automatic transmission - Google Patents

Park lock device for use with automatic transmission Download PDF

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Publication number
US4667783A
US4667783A US06/658,212 US65821284A US4667783A US 4667783 A US4667783 A US 4667783A US 65821284 A US65821284 A US 65821284A US 4667783 A US4667783 A US 4667783A
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US
United States
Prior art keywords
pawl
parking
tooth
transmission
lock device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/658,212
Other languages
English (en)
Inventor
Kazuhiko Sugano
Koichi Hayasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Assigned to NISSAN MOTOR CO., LTD. reassignment NISSAN MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAYASAKI, KOICHI, SUGANO, KAZUHIKO
Application granted granted Critical
Publication of US4667783A publication Critical patent/US4667783A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F16H63/3416—Parking lock mechanisms or brakes in the transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/005—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles by locking of wheel or transmission rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/48—Signals to a parking brake or parking lock; Control of parking locks or brakes being part of the transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19637—Gearing with brake means for gearing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets
    • Y10T74/2136—Pivoted pawls
    • Y10T74/2137—Single tooth

Definitions

  • the present invention relates in general to a parking brake of a motor vehicle, and more particularly to a park lock device for use with a motor vehicle automatic transmission.
  • park lock devices for use with an automatic transmission. Some are of a type including a parking gear securedly mounted on the output shaft of the transmission and a parking pawl which is lockably engageable with the parking gear to achieve locking of the output shaft.
  • the transmission casing tends to become unwantedly bulky and complex inducing design problems when a transmission having such a park lock device is disposed in the crowded engine room of a F-F (front wheel, front engine) type vehicle.
  • a park lock device which comprises a parking gear coaxially and securedly mounted on the output shaft to rotate therewith, a parking pawl pivotally connected to the casing for locking and unlocking the parking gear, the pawl including first and second wing portions which extend in the opposed directions from the pivoted portion of the pawl, the first wing portion being formed with a tooth engageable with a teeth gap of the parking gear, and an actuating mechanism having a cam member which is slidably engageable with the second wing portion thereby to pivot the parking pawl in a direction to achieve the locking engagement between the tooth of the pawl and the teeth gap of the parking gear, the actuating mechanism being positioned essentially inboard of the parking pawl with respect to the transmission casing.
  • FIG. 1 is a front view of a prior art park lock device for use with an automatic transmission
  • FIG. 2 is a side view of the prior art park lock device
  • FIG. 3 is a front view of an improved park lock device for use with an automatic transmission, according to the present invention.
  • FIG. 4 is a side view of the improved park lock device of the present invention.
  • FIGS. 3 and 4 there is schematically shown a park lock device according to the present invention.
  • numeral 10 denotes a parking gear which is coaxially and securedly mounted on an output shaft 11 of the transmission to rotate therewith
  • numeral 12 denotes an arcuate parking pawl for locking the parking gear 10 and thus the output shaft of the transmission.
  • the parking pawl 12 is formed at one end with a tooth 13 which is lockably engageable with a gap 10b defined between adjacent two teeth 10a and 10a of the parking gear 10.
  • the parking pawl 12 is pivotally connected at its intermediate portion to the transmission casing 16 through its intermediate portion to the transmission casing 16 through a pivot shaft 14.
  • the pawl 12 comprises first and second wing portions 12a and 12b which extend in the opposed directions from the pivoted portion. As is seen from FIG. 4, the pivot shaft 14 is supported by both the casing 16 and a side cover 18 of the transmission. Although not shown in the drawings, a return spring is arranged to bias the parking pawl 12 in a direction to disengage from the parking gear 10. At a position near the second wing portion 12b of the parking pawl 12 and between the pawl 12 and the parking gear 10, there is arranged an actuating mechanism 20 which functions to actuate the parking pawl 12 in response to movement of a manual shift lever (not shown) located near the driver's seat.
  • a manual shift lever not shown
  • the actuating mechanism 20 comprises a generally funnel-shaped cam member 22 which is contactable at its cylindrical outer surface with the second wing portion 12b of the parking pawl 12 and axially movable in a direction parallel with the pivot axis 14 of the parking pawl 12.
  • the cam member 22 comprises a larger diameter annular portion 22a and a smaller diameter tubular portion 22b which are coaxially arranged and integrated with each other, as shown.
  • the annular portion 22a includes two tapered cylindrical outer surfaces (no numerals) to serve as a cam.
  • the cam member 22 is formed with an axially extending through bore 22c through which a supporting shaft 24 passes slidably.
  • the shaft 24 is formed with an enlarged head portion 24a by which the leftward movement of the cam member 22 in FIG.
  • a spring seat 26 is secured to the supporting shaft 24 for compressing a coil spring 28 between it and the cam member 22, so that the cam member 22 is biased leftward in FIG. 4 relative to the shaft 24.
  • the rightward end of the shaft 24 is bent to be pivotally engaged with an opening 31 formed in an end portion of a pivotal plate 30.
  • the pivotal plate 30 is pivotally connected at its intermediate portion to the transmission casing 16 through a pivot shaft 32.
  • the other end portion, which is sectoral in shape, of the pivotal plate 30 is formed with a plurality (three in the illustrated example) of spaced recesses 30a, 30b and 30c with which a detent ball 34 is selectively engageable.
  • the detend ball 34 is biased toward the pivotal plate 30 by a spring 36 disposed in a blind bore 38 of the casing 16, so that the pivotal movement of the pivotal plate 30 about the pivot shaft 32 is carried out with a detent feeling.
  • a known link mechanism is operatively connected to the pivotal plate 30 to transmit the movement of the manual shift lever to the plate 30 and thus the supporting shaft 24 of the cam member 22.
  • the actuating mechanism 20 as mentioned hereinabove is positioned inboard of the parking pawl 12 with respect to the transmission casing 16. Furthermore, the arcuate parking pawl 12 is gently curved toward the parking gear 10, as is seen from FIG. 3.
  • the pivotal plate 30 When thereafter the manual shift lever is shifted to another position, for example, "drive” position, the pivotal plate 30 is pivoted in the direction of the arrow A producing the detent feeling. With this, the supporting shaft 24 moves rightward forcing the head portion 24a thereof to push the cam member 22 in the same direction thereby disengaging the most raised cam surface of the cam member 22 from the parking pawl 12. With this, the parking pawl 12 is pivoted back to its inoperative position by the force of the return spring (not shown), so that the parking lock is cancelled. Under this condition, the second wing portion 12b of the parking pawl 12 is in contact with the smaller diameter tubular portion 22b of the cam member 22.
  • the actuating mechanism 20 including the cam member 22 is located inboard of the parking pawl 12 with respect to the transmission casing 16. With this arrangement, the transmission casing 16 can be constructed in a simple manner and is compact in size. This feature will be well understood when comparing with a prior art park lock device as shown in FIGS. 1 and 2 in which identical parts to those of the invention are designated by the same numerals. (This prior art device is disclosed in Japanese Utility Model Application First Publications Nos. 57-19156, 57-65154 and 57-65155). As is understood from FIG. 1, the actuating mechanism 20 in this prior art device is arranged at a back side of the parking pawl 12.
  • the arcuate shape of the parking pawl 12 can place the pawl 12 very close to the transmission casing 16 because outward projection of the leading ends of the first and second wing portions 12a and 12b of the pawl 12 relative to the pivot shaft 14 can be minimized upon pivotal movement of the pawl 12 about the shaft 14. This feature also induces compact construction of the transmission casing 16.
  • the parking pawl 12 is pivoted at its intermediate portion and has the first and second wing portions 12a and 12b extending in the opposed directions from the pivoted portion.
  • the first wing portion is formed with a tooth 13 engageable with the tooth gap 10b of the parking gear 10 and the second wing portion is directly actuated by the actuating mechanism 20.
  • the pawl 12 by providing the pawl 12 with a longer first wing portion and a shorter second wing portion like in the illustrated embodiment (see FIG. 3), the locking and unlocking movement of the parking pawl 12 relative to the parking gear 10 is highly magnified even when the actuation of the cam member 22 to the shorter second wing portion is small. This advantageous feature is not expected from the prior art device of FIGS. 1 and 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Mechanical Control Devices (AREA)
US06/658,212 1983-10-14 1984-10-05 Park lock device for use with automatic transmission Expired - Fee Related US4667783A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP58190672A JPH0617102B2 (ja) 1983-10-14 1983-10-14 パークロック装置のパーキングポール押圧構造
JP58-190672 1983-10-14

Publications (1)

Publication Number Publication Date
US4667783A true US4667783A (en) 1987-05-26

Family

ID=16261967

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/658,212 Expired - Fee Related US4667783A (en) 1983-10-14 1984-10-05 Park lock device for use with automatic transmission

Country Status (3)

Country Link
US (1) US4667783A (de)
EP (1) EP0138186A3 (de)
JP (1) JPH0617102B2 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4917224A (en) * 1988-12-09 1990-04-17 Babcock Industries Inc. Transmission and brake interlock system
WO1991008125A1 (en) * 1989-11-27 1991-06-13 Barrett David M Disk brake interlock
US5078022A (en) * 1990-01-19 1992-01-07 Nippon Seiko Kabushiki Kaisha Tilt type steering apparatus
US5295412A (en) * 1993-07-09 1994-03-22 Chrysler Corporation Park locking mechanism
US5649457A (en) * 1994-04-04 1997-07-22 Nissan Motor Co., Ltd. Park lock arrangement for continuously variable transmission
US5794748A (en) * 1996-10-15 1998-08-18 Ford Global Technologies, Inc. Park lock mechanism for an automatic transmission
US6065581A (en) * 1999-03-31 2000-05-23 Daimlerchrysler Corporation Camming manual lever for pull-out load
US20040082991A1 (en) * 1997-04-03 2004-04-29 Than Nguyen Methods of making bioprosthetic heart valves with strain matched leaflets
US8505705B2 (en) 2009-12-30 2013-08-13 Borgwarner, Inc. Stamped laminated stacks for parking pawl, parking gear and parking anchor
US20190054895A1 (en) * 2017-08-21 2019-02-21 David R. Hall Parking Brake and Anti-Theft Apparatus for Cross-Drilled Brake Systems

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875856A (en) * 1956-03-12 1959-03-03 Gen Motors Corp Parking lock for transmission
US3300001A (en) * 1963-12-30 1967-01-24 Ford Motor Co Transmission braking arrangement
DE1630896A1 (de) * 1967-01-18 1971-07-01 Porsche Kg Geschwindigkeitswechselgetriebe fuer Fahrzeuge mit einer Parksperre
US3601231A (en) * 1969-03-28 1971-08-24 Allis Chalmers Mfg Co Parking brake mechanism
US3690416A (en) * 1969-07-24 1972-09-12 Nissan Motor Parking brake for automatic transmission
DE2427216A1 (de) * 1973-06-08 1975-01-09 Nissan Motor Bremsmechanismus
US3912050A (en) * 1973-04-16 1975-10-14 Nissan Motor Transmission parking lock mechanism
US3990541A (en) * 1975-07-21 1976-11-09 J. I. Case Company Park-lock mechanism for transmission
GB1468492A (en) * 1974-04-11 1977-03-30 Automobilwerk Eisenach Veb Automatic transmission systems
US4031977A (en) * 1975-01-14 1977-06-28 Societe Anonyme Automobiles Citroen Transmission devices for motor vehicles
US4223768A (en) * 1978-09-13 1980-09-23 Nissan Motor Company, Limited Parking mechanism in automatic transmission
US4252219A (en) * 1978-10-20 1981-02-24 General Motors Corporation Transmission lock mechanism
US4275609A (en) * 1979-07-30 1981-06-30 Delaney Gene Positive safety brake for oil well pumping apparatus
US4310081A (en) * 1979-12-26 1982-01-12 Allis-Chalmers Corporation Park lock and range shift control
US4519483A (en) * 1981-11-24 1985-05-28 Ab Volvo Parking brake in a vehicle transmission

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875856A (en) * 1956-03-12 1959-03-03 Gen Motors Corp Parking lock for transmission
US3300001A (en) * 1963-12-30 1967-01-24 Ford Motor Co Transmission braking arrangement
DE1630896A1 (de) * 1967-01-18 1971-07-01 Porsche Kg Geschwindigkeitswechselgetriebe fuer Fahrzeuge mit einer Parksperre
US3601231A (en) * 1969-03-28 1971-08-24 Allis Chalmers Mfg Co Parking brake mechanism
US3690416A (en) * 1969-07-24 1972-09-12 Nissan Motor Parking brake for automatic transmission
US3912050A (en) * 1973-04-16 1975-10-14 Nissan Motor Transmission parking lock mechanism
DE2427216A1 (de) * 1973-06-08 1975-01-09 Nissan Motor Bremsmechanismus
GB1468492A (en) * 1974-04-11 1977-03-30 Automobilwerk Eisenach Veb Automatic transmission systems
US4031977A (en) * 1975-01-14 1977-06-28 Societe Anonyme Automobiles Citroen Transmission devices for motor vehicles
US3990541A (en) * 1975-07-21 1976-11-09 J. I. Case Company Park-lock mechanism for transmission
US4223768A (en) * 1978-09-13 1980-09-23 Nissan Motor Company, Limited Parking mechanism in automatic transmission
US4252219A (en) * 1978-10-20 1981-02-24 General Motors Corporation Transmission lock mechanism
US4275609A (en) * 1979-07-30 1981-06-30 Delaney Gene Positive safety brake for oil well pumping apparatus
US4310081A (en) * 1979-12-26 1982-01-12 Allis-Chalmers Corporation Park lock and range shift control
US4519483A (en) * 1981-11-24 1985-05-28 Ab Volvo Parking brake in a vehicle transmission

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4917224A (en) * 1988-12-09 1990-04-17 Babcock Industries Inc. Transmission and brake interlock system
WO1991008125A1 (en) * 1989-11-27 1991-06-13 Barrett David M Disk brake interlock
US5065848A (en) * 1989-11-27 1991-11-19 Barrett David M Brake-disc-rotor attacher impeller (intersecting/locker)
US5078022A (en) * 1990-01-19 1992-01-07 Nippon Seiko Kabushiki Kaisha Tilt type steering apparatus
US5295412A (en) * 1993-07-09 1994-03-22 Chrysler Corporation Park locking mechanism
US5649457A (en) * 1994-04-04 1997-07-22 Nissan Motor Co., Ltd. Park lock arrangement for continuously variable transmission
US5794748A (en) * 1996-10-15 1998-08-18 Ford Global Technologies, Inc. Park lock mechanism for an automatic transmission
US20040082991A1 (en) * 1997-04-03 2004-04-29 Than Nguyen Methods of making bioprosthetic heart valves with strain matched leaflets
US6065581A (en) * 1999-03-31 2000-05-23 Daimlerchrysler Corporation Camming manual lever for pull-out load
US8505705B2 (en) 2009-12-30 2013-08-13 Borgwarner, Inc. Stamped laminated stacks for parking pawl, parking gear and parking anchor
US20190054895A1 (en) * 2017-08-21 2019-02-21 David R. Hall Parking Brake and Anti-Theft Apparatus for Cross-Drilled Brake Systems
US10449928B2 (en) * 2017-08-21 2019-10-22 Hall Labs Llc Parking brake and anti-theft apparatus for cross-drilled brake systems

Also Published As

Publication number Publication date
JPH0617102B2 (ja) 1994-03-09
EP0138186A2 (de) 1985-04-24
EP0138186A3 (de) 1985-11-13
JPS6082469A (ja) 1985-05-10

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AS Assignment

Owner name: NISSAN MOTOR CO., LTD., NO. 2, TAKARA-CHO, KNAGAWA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:SUGANO, KAZUHIKO;HAYASAKI, KOICHI;REEL/FRAME:004344/0643;SIGNING DATES FROM 19841022 TO 19841025

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Effective date: 19990526

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362